R＆D of lead-glass ring-imaging Cherenkov detector

首先，在目前正在进行的中微子振荡实验K2K中，我们尝试用铅-玻璃探测器探测电子中微子相互作用。在K2K实验中，Ve分量仅为vμ主分量的1%。在这项研究中，我们建立了在大背景下检测小的VE交互作用的方法。对于未来的高灵敏度成像Ne探测器，可能有两种可能的选择：切伦科夫成像探测器和闪烁成像探测器。这两者的区别在于光源的不同，切伦科夫的光还是闪烁的对。前者通过球面反射镜收集光线，得到的粒子图像是屏幕上的一个圆环。后者通过光学透镜采集光线，并在屏幕上显示粒子轨迹图像。这两种类型的探测器非常相似，许多部件/技术是共同的。两者都有很好的成为VE探测器的潜力。因此，我们进行了研发工作，考虑到探测器的发展或Boty类型。在本Graint-In-Aid的第一年，使用蒙特卡罗模拟对探测器进行了概念设计。对两种探测器的性能进行了比较。第二年，购买了NaI闪烁体、光学透镜和像增强管，并制作了探测器样机。和Basid性能进行了考察。去年，我们与京都大学合作，进行了宇宙线测量和束流测试。在宇宙线测量中，记录了清晰的阻止µ子和相关衰变电子的轨迹图像。目前，对宇宙线和束流的分析正在进行中，以定量评估探测器的性能。

First, we tried to detect electron neutrino interaction by using lead-glass detector in the current on-going neutrino oscillation experiment K2K. In the K2K experiment, the ve component is only 1% of the main component of vμ. In this study we established to detect small amont of ve interaction in large background. Also we demonstrated the limitation of convension electromagnetic Calometer in a separated function detector for the ve detection purpose.For the future high-sensitivity imaging ne detector, there might be two possible options ; Cherenkov imaging detector and scintillation imaging detector. The difference between these two is the light source, Cherenkov light or scintillation right. The former one collect the light by spherical mirror and the resulting image of a particle is a ring on the screen. The latter on collect the light by optical lense and a image of particle track is on the screen. These two types of detectors are very similar and many parts/techniques are common. And both have a good potential to be a ve detector. So, we have made R＆D work, keeping the development or boty types of detectors in mind.In the first year of this Graint-in-Aid, conceptual design of the detector was done using Monte-Carlo simulation. Performance of both types of detectors are compared. In the second year, NaI scintillator block, optical lense and Image Intensifier tube were purchased ahd prototype detector was constructed. And basid performance were investigated. In the last year, in cooperation with Kyoto University, we made cosmic-ray measurement and beam test. In the cosmic-ray measurement, clear track images of stopping muons with associated decay electrons were recorded. Currently, analysis of the cosmic-ray and beam iea is underway to evaluate the performance of the detector quiantitatively.